import { describe, expect, it, vi } from "vitest";
import {
  createMockProjectionStore,
  createTestProjection,
  createTestProjectionStoreReadContext,
  createTestTenantId,
} from "../../services/__tests__/testHelpers";

describe("ProjectionStore - Optimistic Locking (Placeholder Tests)", () => {
  const tenantId = createTestTenantId();
  const context = createTestProjectionStoreReadContext(tenantId);

  describe("optimistic locking is not currently implemented", () => {
    it("projection stores use 'last write wins' behavior", async () => {
      const store = createMockProjectionStore();

      const projection1 = createTestProjection("aggregate-1", tenantId, 1000);
      const projection2 = createTestProjection(
        "aggregate-1",
        tenantId,
        2000, // Different version
      );

      // Store first projection
      await store.storeProjection(projection1, context);

      // Store second projection - should overwrite first (last write wins)
      await store.storeProjection(projection2, context);

      // Set up mock to return the stored projection
      vi.mocked(store.getProjection).mockResolvedValue(projection2);

      // Verify last write wins (second projection is stored)
      const retrieved = await store.getProjection("aggregate-1", context);
      expect(retrieved).not.toBeNull();
      // Note: Mock store may not actually implement version checking,
      // but this documents the expected current behavior
    });

    it("concurrent writes result in last write winning", async () => {
      const store = createMockProjectionStore();

      const projection1 = createTestProjection("aggregate-1", tenantId, 1000);
      const projection2 = createTestProjection("aggregate-1", tenantId, 2000);

      // Simulate concurrent writes
      await Promise.all([
        store.storeProjection(projection1, context),
        store.storeProjection(projection2, context),
      ]);

      // Last write should win (no version conflict detection)
      // This documents current behavior - no optimistic locking
    });

    it("projection stores do not detect version conflicts", async () => {
      const store = createMockProjectionStore();

      const projection1 = createTestProjection(
        "aggregate-1",
        tenantId,
        {},
        1000,
        "proj-1",
      );
      const projection2 = createTestProjection(
        "aggregate-1",
        tenantId,
        {},
        500, // Older version - should conflict but doesn't
        "proj-1",
      );

      // Store first projection
      await store.storeProjection(projection1, context);

      // Store second projection with older version - should conflict but doesn't
      // (no optimistic locking, so it overwrites)
      await expect(
        store.storeProjection(projection2, context),
      ).resolves.not.toThrow();

      // Current behavior: no conflict detection, last write wins
    });
  });

  describe("expected future behavior (documentation)", () => {
    it("optimistic locking should detect version conflicts when implemented", () => {
      // This test documents expected behavior for future implementation
      // When optimistic locking is implemented:
      // - storeProjection should check version before updating
      // - If version conflict detected, should throw OptimisticLockError
      // - Should return conflict information for retry logic
      expect(true).toBe(true); // Placeholder assertion
    });

    it("optimistic locking should allow retry logic when implemented", () => {
      // This test documents expected behavior for future implementation
      // When optimistic locking is implemented:
      // - OptimisticLockError should include existing projection
      // - Caller can retry with updated version
      // - Retry logic can be implemented at service level
      expect(true).toBe(true); // Placeholder assertion
    });

    it("optimistic locking should work with distributed locking when implemented", () => {
      // This test documents expected behavior for future implementation
      // When optimistic locking is implemented:
      // - Can be used together with distributed locking
      // - Distributed locking prevents concurrent rebuilds
      // - Optimistic locking detects version conflicts during updates
      expect(true).toBe(true); // Placeholder assertion
    });
  });
});
